Wettability of Graphite/Ni plus Cr System

摘要：

　　Carbon fiber reinforced CMCs (ceramic matrix composites) are promising high temperature structural materials for aeronautical and astronautical industries.But the engineering application of the materials strongly depends on the joining technique.As a fundamental research,high strength graphite can be used to simulate carbon fiber.The study of wettability of graphite by liquid metals contributes to the development of joining technique of carbon fiber reinforced CMCs.The wettability of graphite/Ni plus Cr system was investigated using the sessile drop method.The contact angle was determined by high temperature photography.The microstructure and composition of the interracial zone were analyzed by SEM,EDX and XRD.The contact angle of graphite/Ni plus Cr system decreases with increasing the Cr content.It becomes zero,when the Cr content reaches 50wt%.The wetting of graphite/Ni plus Cr system is chemical wetting.The contact angle of the system decreases with increasing the wetting temperature or prolonging the holding time.The higher the Cr content,the more remarkable the effects of the temperature and the holding time on the contact angle are.Microstructure and phase analysis reveals that inter-diffusions and interfacial reactions take place in the wetting process.The reaction products include Cr3C2.The formation of Cr3C2 contributes to the interfacial bonding and results in the accumulation of Cr in the interfacial zone.

关键词： Wettability Contact angle Interface Graphite

作者: Shujie Li Minjian Song Yunling Xia Yuehui He Yangwu Mao

作者单位: School of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics,Beiji State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,China

会议类型: 国际会议

会议名称: The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))

会议地点: 长沙

会议语种:英文

页码: 1621-1624

在线出版日期: 2007-05-10（万方平台首次上网日期，不代表论文的发表时间）